[Image of a wiring diagram for a Harley-Davidson Softail]
Key:
* Red = Positive (+)
* Black = Negative (-)
* Green = Ground
* Blue = Ignition
* Yellow = Headlight
* Brown = Taillight
* Orange = Turn signals
* Purple = Brake lights
* White = Speedometer
* Pink = Tachometer
* Grey = Fuel gauge
* Light Blue = Oil pressure gauge
* Dark Blue = Temperature gauge
Battery:
The battery is the power source for the entire motorcycle. It is connected to the positive (+) and negative (-) terminals on the starter solenoid.
Starter Solenoid:
The starter solenoid is a relay that allows current to flow from the battery to the starter motor. It is activated by the starter button on the handlebars.
Starter Motor:
The starter motor is an electric motor that cranks the engine over to start it. It is connected to the positive (+) and negative (-) terminals on the starter solenoid.
Ignition Switch:
The ignition switch turns the power on and off to the motorcycle. It is connected to the positive (+) terminal on the battery and the blue (ignition) wire.
Headlight:
The headlight illuminates the road ahead of the motorcycle. It is connected to the positive (+) terminal on the battery and the yellow (headlight) wire.
Taillight:
The taillight illuminates the rear of the motorcycle and makes it visible to other motorists. It is connected to the positive (+) terminal on the battery and the brown (taillight) wire.
Turn Signals:
The turn signals indicate the direction the motorcycle is turning. They are connected to the positive (+) terminal on the battery and the orange (turn signals) wire.
Brake Lights:
The brake lights illuminate when the brakes are applied to warn other motorists that the motorcycle is slowing down or stopping. They are connected to the positive (+) terminal on the battery and the purple (brake lights) wire.
Speedometer:
The speedometer measures the speed of the motorcycle. It is connected to the positive (+) terminal on the battery and the white (speedometer) wire.
Tachometer:
The tachometer measures the engine speed. It is connected to the positive (+) terminal on the battery and the pink (tachometer) wire.
Fuel Gauge:
The fuel gauge measures the amount of fuel in the motorcycle's tank. It is connected to the positive (+) terminal on the battery and the grey (fuel gauge) wire.
Oil Pressure Gauge:
The oil pressure gauge measures the oil pressure in the motorcycle's engine. It is connected to the positive (+) terminal on the battery and the light blue (oil pressure gauge) wire.
Temperature Gauge:
The temperature gauge measures the temperature of the motorcycle's engine. It is connected to the positive (+) terminal on the battery and the dark blue (temperature gauge) wire.
Ground:
All of the negative (-) wires in the wiring diagram are connected to the motorcycle's frame, which acts as a ground.
